<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title></title>
    <style>
    h2 {
      width: 200px;
      background-color: pink;
    }
    </style>
    <link href="css/style.css" rel="stylesheet">
  </head>
  <body>
  <h2>这是标题内容，这是标题内容</h2>
  </body>
</html>
